Allow vpath builds and regression tests to succeed on Mingw. Backpatch to release 8.4 - earlier releases would require more changes and it's not worth the trouble.

linking both executables and shared libraries, and we add on LDFLAGS_EX when
linking executables or LDFLAGS_SL when linking shared libraries.  This
provides a significantly cleaner way of dealing with link-time switches than
the former behavior.  Also, make sure that the various platform-specific
%.so: %.o rules incorporate LDFLAGS and LDFLAGS_SL; most of them missed that
before.  (I did not add these variables for the platforms that invoke $(LD)
directly, however.  It's not clear if we can do that safely, since for the
most part we assume these variables use CC command-line syntax.)

Per gripe from Aaron Swenson and subsequent investigation.

normalization.

of pwd vs. pwd -W is correctly a function of the build system, not the
host system.

but I think this is enough to turn the buildfarm green again.

- Really prepare statements
- Added more regression tests
- Added auto-prepare mode
- Use '$n' for positional variables, '?' is still possible via ecpg option
- Cleaned up the sources a little bit

regression driver into two parts and reusing half of it. Required to
run ECPG tests without a shell on MSVC builds.

Fix ECPG thread tests for MSVC build (incl output files).

Joachim Wieland and Magnus Hagander

  win32 threads.
- Fixed regression tests to run threading tests.

create expected file with correct port number

Added some interval checks to regression suite.

Changed file paths in expected files too.

builds all the files needed for its regression tests, but the tests
themselves fail because of diffs in the #line directives output by
ecpg itself.  Not sure what to do about that.

not merely remove their contents.  Else 'cvs update' complains.

Implemented EXEC SQL UNDEF.
Applied first version of the regression test patch by Joachim Wieland <joe@mcknight.de>.

 Fixed missing continuation line character.
 Do not translate $-quoting.
 Bit field notation belongs to a variable not a variable list.
 Output of line number only done by one function.

Added some default rules to lexer
Added log output to prepare statement
Added some more stuff to a test case

- Added another test case.

- Added patch by Gavin Scott <gavin@planetacetech.com> for Intel 64bit hardware.

- Fixed bug that reversed string length in typedefs.
- Added portability file to pgtypeslib.

from our code.

Allow additional thread flags to be added via port templates.

Change thread flag names to PTHREAD_CFLAGS and PTHREAD_LIBS to match new
configure script.

  where one argument takes the result.
- Applied thread patches by Lee Kindness

tools/thread to run even if configure didn't enable threads because this
test is used before enabling threads for the OS.

$Header: -> $PostgreSQL Changes ...